Abstract
The Al 27 nuclear resonance in AlZn and AlMg has been studied as a function of composition, temperature and applied magnetic field. At temperatures where the dipolar width is motionally narrowed but where the quadrupole splitting of the satellite lines is not, the second order quadrupole shift of the central transition is readily measureable. It is then possible to measure directly the average electric field gradient at the Al nuclei and the average Al Knight shift in the alloy. The measured gradients are essentially the same in AlMg and AlZn alloys consistent with the suggestion that the gradients arise from the electronic charge distribution about the solute and not from strain effects. The average gradients are of the order of 1 × 10 23cm −3. The Al Knight shift in the alloys is equal to that in pure Al to within the experimental uncertainty. The results are compared with the previous experiments of rowland and the theory of B landin and F riedel.
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